I am trying to set up a simple system - temp/humidity - with an old EL008 logger. When I try to select the sensors, in the drop down menu I can only see 'Mains 240', 'mains on' ect...., but no 'Temp sensor' as I would expect. Is the logger too old for the software now?

The software will work with the EL008, you have to autoconfigure so the logger can find the devices that are connected to it, then you got to locations to add the channels and then you click on programme to pass configuration to the logger.

To get into this section you need to select, Settings->Configuration-> Change and then Advanced. Then select Normal if a window pops up.